Same problem here!
All repositories are lost, but it's not the only problem!

-Maybe cause I used the heavy "reboot" command these last 2 days.
-Since 2 days Extras-devel & Extras-testing are always blocked.
-Media player can't find any media files(but i can run them by the file manager).
-The display menu in the settings does not open(it does now).

If anyone would have any idea about how to fix this... It would be great!

Thanks dudes.